I'm looking to start up commercially on a part time basis in the next year or two, when i'm happy that my brewing knowledge and skills are up to scratch.
I've owned business's in the past and still part own a small garment printing setup, so i know just how hard it is to get things up and running, alas the actual brewing is just the tip of of the iceberg cost wise.
Even so, a ruined batch on a 2-4 barrel brew is still a lot of time and money down the drain literally if things arent right.
Allthough none of this will put me off, it will just take time and planning to do properly. :)
The Microbrewers Handbook is definately worth getting.